private void SetAttendance(IEnumerable <Guid> aStudentIds)
{
if (mAppService.AppState.SelectedSection.AttendingStudents != null)
{
return;
}
mAppService.AppState.SelectedSection.AttendingStudents = new ObservableCollection <AttendingStudent>();
foreach (Guid theGuid in aStudentIds)
{
var theStudent = mDataService.GetStudent(theGuid);
if (theStudent != null)
{
AttendingStudents.Add(new AttendingStudent()
{
Id = theGuid, Name = theStudent.ToString(), IsAttending = true
});
}
}
}
private void StudentIds_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
if (e.OldItems != null)
{
var theStudentsToRemove = new List <AttendingStudent>();
foreach (Guid theGuid in e.OldItems)
{
foreach (var theStudent in AttendingStudents)
{
if (theStudent.Id == theGuid)
{
theStudentsToRemove.Add(theStudent);
}
}
}
foreach (var theStudent in theStudentsToRemove)
{
AttendingStudents.Remove(theStudent);
}
}
if (e.NewItems != null)
{
foreach (Guid theGuid in e.NewItems)
{
var theStudent = mDataService.GetStudent(theGuid);
if (theStudent != null)
{
AttendingStudents.Add(new AttendingStudent()
{
Id = theGuid, Name = theStudent.ToString(), IsAttending = true
});
}
}
}
}